Printing Nano-structures for LEDs, PVs and MEMS
Vladimir Bulović
M.I.T., Organic and
Nanostructured Electronics Laboratory,
Three related thin-film stamping techniques
recently enabled development of pixelated quantum dot LEDs and PVs, patterned molecular LEDs, and large-area MEMS arrays: The additive stamp-printing of
patterned single layers of colloidal quantum dots (QDs) led to development of
high-efficiency QD-LEDs that recently demonstrated external quantum
efficiencies of > 18%, corresponding to the internal quantum efficiencies of
>90%; The subtractive
stamp-printing of molecular multilayer films generated the highest
resolution printed molecular LED patterns, with high fidelity of sub-micrometer
definition; The print-transfer of macroscopic metal films of nanoscale
thickness dramatically simplified fabrication of MEMS arrays and enabled
fabrication of previously hard-to-fabricate mechanical structures that were
recently used as paper-thin speakers and tunable optical micro-cavities. The talk will quantify the nano-scale
mechanisms behind the above thin-film stamping techniques, enumerate the device
technology advancements that these new nano-scale manufacturing processes
already brought, and project on how will they further extend the state of the
art of large-area nano-scale fabrication.
Host: Prof. V. Podzorov